A8N-SLI deluxe Memory Issues....Still having Trouble

Discussion in 'Asus' started by Guest, Apr 13, 2005.

  1. Guest

    Guest Guest

    Ok Guys, I'm still not able to get the two sets of memory (see below) to work together. Can ne1 tell me
    if they should/shouldn't work together? when I put the two 512mb sticks in A1 and B1 and the 256mb
    sticks in A2 and B2 I only get 512mb's of ram showing up instead of 1.5gb. The same thing happens if
    I reverse the sticks...smaller sticks in A1 and B1. I've used all different BIOS versions upto 1006. Any help
    here would be appreaciate. Thanks all. Ed
    Modules installed in my system (slots a1 and b1).
    won't. Asus Doc's are a little confusing
     
    Guest, Apr 13, 2005
    #1
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  2. Guest

    Paul Guest

    So, you've tested the pairs of sticks separately, and they report
    512MB dual channel and 1GB dual channel ?

    About the only algorithm I can suggest, is install the slow memory
    first, in A1 and B1. Enter the BIOS and set the memory timings
    manually (2.5-3-3-8 according to one report). Using that slow
    timing should also suit the faster memory you will be adding
    later. Set Command Rate to 2T (in preparation for operation of
    four sticks at DDR400). Set Vdimm voltage to a value between
    say 2.6V and 2.75V (unless the memory packaging of all DIMMs
    says they can take more than that). Save and exit.

    Boot and test the memory (memtest86+ from memtest.org). Just a
    quick one pass, to verify no stuck bits in the memory.
    Now, shut down and unplug the computer. (With memtest86, hit
    <esc>, then hit the power switch.) Install the second set of
    sticks. The manual timings used in the first step, should still
    be good enough to make it work. See if it boots now.

    The Asus manual contains the disturbing phrase "always install
    DIMMs with the same CAS latency". I hope they are referring to
    a matched pair installed in Ax and Bx, as opposed to insisting that
    all four sticks have matching CAS. A decent BIOS should be able
    to calculate the slowest timing of all the sticks, and use that
    timing to set up the memory controller.

    Paul
     
    Paul, Apr 13, 2005
    #2
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  3. Guest

    FG Guest

    Have you checked your voltages ?
    With a defective PSU voltage can be too low to
    support more than one stick.

    Unlikely, but..

    It happened here.
     
    FG, Apr 13, 2005
    #3
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